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fntlnz merged 2 commits into from
Feb 18, 2026
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claude instructions on how to patch criu #9

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chore: add .worktrees/ to .gitignore
fntlnz Feb 18, 2026
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docs: claude instructions on how to patch criu
fntlnz Feb 18, 2026
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1 change: 1 addition & 0 deletions .gitignore
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Expand Up @@ -6,3 +6,4 @@ _CPack_Packages
.idea/
*.swp
*.swo
.worktrees/
39 changes: 38 additions & 1 deletion CLAUDE.md
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Expand Up @@ -27,6 +27,43 @@ sudo cmake --install build
cpack --config build/CPackConfig.cmake --verbose -B dist -G STGZ
```

### Patching CRIU

We are patching criu with the patches in the `patches/` folder.
From time to time we will need to update the CRIU version in our CMakeLists.txt.

To make sure that everything works, you can clone criu in `/tmp/criu` via

```bash
git clone https://github.com/checkpoint-restore/criu.git /tmp/criu
```

Then ask the user which version they want to try to update criu-static to.

Once you have done that change the git commit to the version that the user wants to test.

Now apply the patches in `patches` one by one making sure that criu builds.

To build criu, however you have to first obtain all the dependencies, but not any dependency. You want
the same dependencies that criu-static uses. criu-static patches criu to use CFLAGS and LDFLAGS
and other env variables instead of pkg-cinfig, you can inspect what it does by checking `CMakeLists.txt`
That `CMakeLists.txt` will output the env vars you have to use, it will become something like (paths might be wrong, double check, this was in a devcontainer!)

```bash
export CFLAGS="-I/workspaces/criu-static/build/protobuf-c-install/include -DCONFIG_HAS_NFTABLES_LIB_API_1 -I/workspaces/criu-static/build/protobuf-install/include -I/workspaces/criu-static/build/libnet-install/include -D_BSD_SOUR
CE -D_DEFAULT_SOURCE -DHAVE_NET_ETHERNET_H -I/workspaces/criu-static/build/libnl-install/include -I/workspaces/criu-static/build/libnl-install/include/libnl3 -I/workspaces/criu-static/build/libcap-install/include -I/workspaces/criu-static/build/libaio-insta
ll/include -I/workspaces/criu-static/build/zlib-install/include -I/workspaces/criu-static/build/libnftables-install/include -I/workspaces/criu-static/build/libnftnl-install/include -I/workspaces/criu-static/build/libmnl-install/include -I/workspaces/criu-st
atic/build/util-linux-install/include -I/workspaces/criu-static/build/libintl-install/include"
export LDFLAGS="-static -L/workspaces/criu-static/build/protobuf-c-install/lib -lprotobuf-c -L/workspaces/criu-static/build/protobuf-install/lib -lprotobuf -L/workspaces/criu-static/build/libnet-install/lib -lnet -L/workspa
ces/criu-static/build/libnl-install/lib -lnl-3 -L/workspaces/criu-static/build/libcap-install/lib -lcap -L/workspaces/criu-static/build/libaio-install/lib -laio -L/workspaces/criu-static/build/zlib-install/lib -lz -L/workspaces/criu-static/build/libnftables
-install/lib -lnftables -L/workspaces/criu-static/build/libnftnl-install/lib -lnftnl -L/workspaces/criu-static/build/libmnl-install/lib -lmnl -L/workspaces/criu-static/build/util-linux-install/lib -luuid -L/workspaces/criu-static/build/libintl-install/lib -
lintl"
```

plus all other env vars like CONFIG_AMDGPU, STATIC_PLUGINS, CUDA_PLUGIN_LIBCAP_CFLAGS but double check the cmake file to see what you have to pass.



### Alternative presets
- `static-debug` - Debug build with debug symbols
- `static-release` - Release build (default, optimized)
Expand Down Expand Up @@ -72,4 +109,4 @@ The build enables static plugins (STATIC_PLUGINS=y) and specifically compiles th

### License Management

The build system automatically tracks all dependency licenses and consolidates them into `THIRD-PARTY-LICENSES.txt` for distribution compliance.
The build system automatically tracks all dependency licenses and consolidates them into `THIRD-PARTY-LICENSES.txt` for distribution compliance.